Dental impression-cup.



No. 702,645. Patented lune l7, I902.

W.v E. .GRISWULD.

DENTAL IMPRESSION CUP.

(Application filed July 28, 1900.)

(No Model.)

m: NORRIS PETERS co. Howxuma. WASHINGTON, n, c.

UNITED STATES I PATENT OFFICE.

WILLIAM E. GRISWOLD, OF DENVER, COLORADO, ASSIGNOR, BY DIRECT AND MESNEASSIGNMENTS, TO GRISWOLD DENTAL BRIDGE COMPANY, OF DENVER, COLORADO, ACORPORATION OF COLORADO.

DENTAL lMPRESSlON-CUP.

srEcIFIcATIoN :fbrming part of Letters Patent No. 702,645, dated June17, 1902.

Appli ation filed Jul -2s, 1900. swarm. 25,171. (No model.)

To all whom it may concern:

Be it known that I,WILLIAM E. GRIswoLD,

a citizen of the United States,residin g at Den ver, in the county ofArapahoe and State of 5 Colorado, have invented certain new andusefulImprovementsinDentalImpression-Cups; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

My invention relates to dental impressioncups or trays. Its object is toprovide an instrument by which I can accurately determine the positionthe bridge is to permanently assume in place.

It consists, essentially, of an adjustable presser-rod or similar partcushioned andiarranged to play in an ordinary impression-cup or tray, sothat it will press home the saddle of the bridge into the soft tissuesof the gum under the action of the jaw in biting.

In the accompanying drawings, Figure l is a View in perspective of atray or impressioncup with my device located, and Fig. 2 is a verticalcentral section.

In the drawings, 1 represents a cup or tray. 2 is a hollow standardwhich receives a threaded free rod 3 with a yoke 4 at the top, and 5 isa rubber cushion in which rests the standard 2. It is obvious that theproper adj ustment can be made by the threaded rod 3 and the hollowstandard 2. The rubber cushion need have only an ordinary recess or 3 5cavity to receive the foot of the standard 2. The device plays up anddown easily through a perforation in the bottom of the tray orimpression-cup.

In use Iput in the cup, preferably, a threeminute plaster, sothat'theremay be time to adjust in the mouth. I place the cup inposition with the yoke 4 pressing against the saddle and the rubber;5resting on the occluding teeth. I then have the patient bite withconsiderableforce, observing that all parts are correctly located andadjusted, and then forc'e upihe tray or cup containing the plasteror'similancasting material. I thus secure an impression with the saddleforced against the soft tissues with all the force which willsubsequently be used in mastication, an impression which enables me toso- I have termed the device which plays throughithe cup a presser-rodfor convenience, the term being intended to cover any device working inconjunction with an impression-cup' to force a saddle or similar partintothe tissues of the mouth by the action cure an exact fit for thebridge.

of the j aw; in'biting.

It isobvious that mechanical changes in the presser-rod and its cushionmay be readily made without departing from the principle of theinvention. 7

Having fully described my invention, what I claim is 1. The combinationwith an impression cup, of a presser-rod, one end of the rod adapted toengage a saddle and the other end adapted to rest upon the opposite jawto force 76 the saddle into the tissues of the mouth by the action ofthe jaw in biting.

2. The combination with an impressioncup, of an adjustable presser-rod,playing through the cup, one end of the rod adapted to engage a saddleand the other end adapted to rest upon the opposite jaw to force thesaddle into the tissues of the month by the action of the jaw in biting.

3. The combination with an impression- 80 cup, of a cushioned presserrod playing through the cup for the purposes described.

In testimony whereof I affix my signature in presence of two witnesses.WILLIAM E. CRISWOLD.

Witnesses:

WALTER F. ROGERS, EDNA A. HUGHES.

